D FUP 8.36 Stability of compounds in new drugs. Refer to the ACS Medicinal Chemistry Letters (Vol. 1, 2010) study of the meta- bolic stability of drugs, Exercise 2.35 (p. 49). Recall that two NW important values computed from the testing phase are the fraction of compound unbound to plasma (fup) and the frac- tion of compound unbound to microsomes (fumic). A key formula for assessing stability assumes that the fup/fumic ratio is 1. Pharmacologists at Pfizer Global Research and Development tested 416 drugs and reported the fup/fumic ratio for each. These data are saved in the FUP file, and sum- mary statistics are provided in the accompanying MINITAB printout. Suppose the pharmacologists want to determine if the true mean ratio, μ, differs from 1. a. Specify the null and alternative hypothesis for this test. b. Descriptive statistics for the sample ratios are provided in the accompanying MINITAB printout. Note that the sample mean, x=.327, is less than 1. Consequently, a pharmacologist wants to reject the null hypothesis. What are the problems with using such a decision rule? c. Locate values of the test statistic and corresponding p-value on the printout. d. Select a value of a, the probability of a Type I error. Interpret this value in the words of the problem. e. Give the appropriate conclusion, based on the results of parts c and d. f. What conditions must be satisfied for the test results to be valid? One-Sample T: RATIO Test of mu 1 vs not = 1 Variable N Mean RATIO 416 0.3269 0.2915 StDev SE Mean 0.0143 95% CI (0.2988, 0.3550) -47.09 I _P 0.000

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D
FUP
8.36 Stability of compounds in new drugs. Refer to the ACS
Medicinal Chemistry Letters (Vol. 1, 2010) study of the meta-
bolic stability of drugs, Exercise 2.35 (p. 49). Recall that two
NW important values computed from the testing phase are the
fraction of compound unbound to plasma (fup) and the frac-
tion of compound unbound to microsomes (fumic). A key
formula for assessing stability assumes that the fup/fumic
ratio is 1. Pharmacologists at Pfizer Global Research and
Development tested 416 drugs and reported the fup/fumic
ratio for each. These data are saved in the FUP file, and sum-
mary statistics are provided in the accompanying MINITAB
printout. Suppose the pharmacologists want to determine if
the true mean ratio, μ, differs from 1.
a. Specify the null and alternative hypothesis for this test.
b. Descriptive statistics for the sample ratios are provided
in the accompanying MINITAB printout. Note that the
sample mean, x=.327, is less than 1. Consequently,
a pharmacologist wants to reject the null hypothesis.
What are the problems with using such a decision rule?
c. Locate values of the test statistic and corresponding
p-value on the printout.
d. Select a value of a, the probability of a Type I error.
Interpret this value in the words of the problem.
e. Give the appropriate conclusion, based on the results of
parts c and d.
f. What conditions must be satisfied for the test results to
be valid?
One-Sample T: RATIO
Test of mu 1 vs not = 1
Variable N Mean
RATIO
416 0.3269
0.2915
StDev SE Mean
0.0143
95% CI
(0.2988, 0.3550) -47.09
I
_P
0.000
Transcribed Image Text:D FUP 8.36 Stability of compounds in new drugs. Refer to the ACS Medicinal Chemistry Letters (Vol. 1, 2010) study of the meta- bolic stability of drugs, Exercise 2.35 (p. 49). Recall that two NW important values computed from the testing phase are the fraction of compound unbound to plasma (fup) and the frac- tion of compound unbound to microsomes (fumic). A key formula for assessing stability assumes that the fup/fumic ratio is 1. Pharmacologists at Pfizer Global Research and Development tested 416 drugs and reported the fup/fumic ratio for each. These data are saved in the FUP file, and sum- mary statistics are provided in the accompanying MINITAB printout. Suppose the pharmacologists want to determine if the true mean ratio, μ, differs from 1. a. Specify the null and alternative hypothesis for this test. b. Descriptive statistics for the sample ratios are provided in the accompanying MINITAB printout. Note that the sample mean, x=.327, is less than 1. Consequently, a pharmacologist wants to reject the null hypothesis. What are the problems with using such a decision rule? c. Locate values of the test statistic and corresponding p-value on the printout. d. Select a value of a, the probability of a Type I error. Interpret this value in the words of the problem. e. Give the appropriate conclusion, based on the results of parts c and d. f. What conditions must be satisfied for the test results to be valid? One-Sample T: RATIO Test of mu 1 vs not = 1 Variable N Mean RATIO 416 0.3269 0.2915 StDev SE Mean 0.0143 95% CI (0.2988, 0.3550) -47.09 I _P 0.000
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